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Tolga Karabulut

@tolgakarabulut

Senior Backend Developer at Ono AI Based Recruitment Platform, integrating GPT, VAPI, and Rital into a modular monolith.

Turkey

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At Ono AI Based Recruitment Platform, I work on a modular monolith transition and integrate GPT, VAPI, and Rital. My work also includes SQL optimization and LinkedIn OAuth and Zoom API integrations.

At Airalo, I integrated infrastructure for more than 10 global operators and worked on real-time package and balance renewal systems. I also improved the architecture of a partner management system and integrated AWS SQS and CloudWatch.

Across my backend roles, I’ve worked on telecom integrations, payment systems, and high-traffic content delivery. I’ve focused on scalable backend architecture and performance, using PHP and Laravel alongside tools and technologies such as Symfony, Node.js, and AWS.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Developer

Current

Ono AI Based Recruitment Platform

Jul 2025 - Present (1 year 3 months)

Led modular monolithic transition and implemented service-manager, interface, and repository patterns. Integrated AI capabilities with GPTs, VAPI, and Rital, and optimized SQL performance with PHPUnit data providers.

Laravel Redis Horizon GitHub Actions Laravel Forge SQL PHPUnit GPT VAPI Rital Go Deepl LinkedIn Authentication Zoom APIs

Senior Backend Developer

Teknasyon - esim.io

Feb 2024 - Jun 2025 (1 year 4 months)

Architected Symfony-based systems and led financial system transformation from prepaid to pay-as-you-go with CDR integration. Integrated payment and notification services via Zotlo and FCM, and onboarded global operators.

Symfony RabbitMQ MySQL Redis Zotlo FCM Graylog PHPUnit

Senior Backend Developer

Airalo

Aug 2021 - Aug 2023 (2 years)

Managed integration of over 10 global operators and architected real-time package and balance renewal systems. Improved observability with AWS SQS and CloudWatch, and enhanced partner management system architecture.

Laravel MySQL RabbitMQ AWS Amazon SQS Lambda Cloudwatch

Senior PHP Developer

Medianova CDN

Dec 2019 - Jun 2021 (1 year 6 months)

Developed backend and system tools for high-traffic CDN solutions serving media and government clients. Managed live streaming infrastructure with Kaltura and contributed to Laravel V2 migration.

PHP Laravel NodeJS Nginx Kaltura